Walmart offers the Uniden 7-watt Speaker Stereo Plug for Scanner and CB, model no. BC7, for $10.60. (Amazon charges the same.) Opt for in-store pickup to dodge to the $5.97 shipping charge. That's the lowest total price we could find by $2. Designed for CB scanners, it features a 6-foot cord, frequency response of 500Hz-5kHz, and 3.5mm jack.